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參數資料
| 型號： | 3656 |
| 元件分類： | 隔離放大器 |
| 英文描述： | Transformer Coupled ISOLATION AMPLIFIER |
| 中文描述： | 變壓器耦合隔離放大器 |
| 文件頁數： | 17/17頁 |
| 文件大小： | 149K |
| 代理商： | 3656 |
3656
9
Total amplifier gain:
G = G1 G2 = VOUT VIN
Input Stage:
G1 = 1 + (RA/FA)
(Select G
1 to be less than 5V/full scale VIN to limit
demodulator output to 5V).
RA + RF ≥ 2M
(Select to load input demodulator with at least 2M
).
RC = RA || (RF + 100k) =
(Balance impedances seen by the + and – inputs
of A1 to reduce input offset caused by bias current).
Output Stage:
G2 = 1 + (RX/RK)
(Select ratio to obtain VOUT between 5V and 10V
full scale with VIN at its maximum).
R
X || RK = 100k
(Balance impedances seen by the + and – inputs
of A
2 to reduce effect of bias current on the
output offset).
RB = RA + RF
(Load output demodulator equal to input demodulator).
Inverting Gain, Voltage or Current Input
The signal portion of Figure 4 shows two possible inverting
input stage configurations: current and input, and voltage
input.
Input Stage:
For the voltage input case:
G1 = –RF/RS
(Select G1 to be less than 5V/full scale VIN
to limit the demodulator output voltage to 5V).
R
F = 2M
(Select to load the demodulator with
at least 2M
).
R
C = RS || (R1 + 100k) =
(Balance the impedances seen by the + and– inputs of A1).
For the current input case:
V
OUT = –IIN RF G2
RC = RF
RF may be made larger than 2M if desired. The 10pF
capacitors are used to compensate for the input capacitance
of A1 and to insure frequency stability.
Output Stage:
The output stage is the same as shown in equations (5), (6),
and (7).
(1)
(2)
(3)
(11)
(12)
(8)
FIGURE 4. Power: Two-Port, Single Supply; Signal: Inverting Gains.
(4)
R
A (RF + 100k)
R
A + RF + 100k
(5)
(6)
(7)
(9)
R
S (RF + 100k)
R
S + RF + 100k
(10)
D
M
I/P PWR
100k
+
–
0.47F
–
+
19
20
10pF
R
F = 2M
R
B = 2M
V
IN
+
–
R
S
10pF
R
C
I
IN
V
OUT
7
4
6
9
2
10
15
11
13
17
16
12
O/P PWR
Pulse GEN
1
3
14
A
2
A
1
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